Carbureter.



E. N. BRODERICK.

CARBURETER. APPLlcMmN min ocr. 29, |912. nzuswfn MAR. l. |916.

L'wm.. Patented me, 5, 19116.

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E. N. BRODERICK.

CARBURETER. APPLICATION FILED ocT. 29. 1912A RENEWED MAR. l, |916.

Lfwm. Patented Dec. 5,1916.

2 SHEETS-SHEET 2. /5 W MWF.

ERNEST 1\T. BRODERICK, OF DETROIT, IVIICHIGAN.

CARBURETER.

Specification of Letters Patent.

Patented lDec. 5, 1915.

AppIication filed October 29, 1912, Serial No. 728,470. Renewed March 1, 1916. Serial No. 81,551.

To all whom t may concern.'

Be it known that i, ERNEST N. BRoDEnICx, a citizen of the United States of America, residing at Detroit, in the county of Wayne and State of Michigan, have invented certain new and useful Improvements in Carbureters, of which the following is a specification, reference being had therein to the accompanying drawings.

In supplying fuel to multi-cylinder motors7 it is diflicult to get adequate distribution and equal amount to each cylinder es pecially in the larger sized engines from a single carbureter.

This invention relates to a carbureter adapted to furnish fuel for internal combustion engines of large capacity and of the multi-cylinder type and it includes means for insuring efficient mixture of the fuel supply together with adjusting devices whereby the character of the fuel can be varied to meet different conditions of service.

The invention consists in the matters hereinafter set forth and more particularly pointed out in the appended claims.

Referring to the drawings, Figure 1 is a view partially in side elevation and partially in sectionl of a carbureter that embodies features of the invention; Fig. 2 is a plan view of the carbureter partially broken away, showing a controlling valve closed and another controlling valve opened; Fig. 3 is a view in section on the line lll- III of Fig. 2; Fig. 1 is a view in section on line IV-IV of Fig. 1; Fig. 5 is a view on or about line V-V of Fig. 2; and Fig. 6 is a view in detail of a main air supply gate.

As shown herein in preferred form a base 1 of suitable design for a fuel supply chamber, has a pair of upright air inlet tubes 2 extending therethrough, with a gate 3 provided with air openings arranged to control the open lower end of each. The form and arrangement and source of fuel supply to this base do not form per se part of this invention further than that a fuel inlet nozzle fl in each tube is supplied through suitable connections with the interior of the base, such nipple forming at its mouth a seat for a needle valve and being disposed in an air tube 2 so that fuel ejected or drawn out therefrom mingles intimately with the passing air current of the tube.

A .pair of mixing `chamber casings 5 are suitably secured on the base 1 as a cover therefor. Each casing has a lateral outlet nipple 6, interiorly screw threaded or otherwise fitted for connection with the intake manifold of a motor. An auxiliary air inlet nipple or boss 7 preferably extends from the opposlte side of the casing, preferably in axial alinement with the outlet. A cylindrical closure 8 is rotatably secured in the casing and has a bore 9 adapted to accurately register with the air inlet 7 and a wider bore 10 that may be brought into conjunction with the outlet opening of the nipple 6, so that partial closing of the bore 9 kdoes not necessarily throttle the outlet.

The inlet boss 7 preferably has a flaring or bell mouth as indicated at 11 with an arched or crowned upper deflecting face 12 whereby indrawn air is directed obliquely downward .through the bore 9. A deflector plate 13 is adjustably secured between suitable guide plates 14: on the inside of the valve closure 8 so that it still further de fleets the incoming air toward the base of the casing. To secure accurate adjustment and also to give the current of'incoming air a slight sidewise motion the lower face of the plate is disposed obliquely as shown more clearly in Fig. 5. Vertical adjustment of the plate 13 is obtained by a screw 15 passing through the top of the casing with a spring plate 16 in frictional engagement with an annular flange 17 on a screw head whereby the latter is prevented from backing out.

A needle closure 18 for the valve seat at the mouth of the nozzle t is rotatable in a boss 19 of the guide plates 1A and in the stem 20 of the closure S that is journaled in a boss 21 on the casing. A throttle lever 22 clamped on the projecting portion of the stem 20 affords means for rotating the closure.

A yoke 23 with its lower end adjustably secured around the boss 21 has a guide opening in its upper arm in which a bushing 25 is reciprocable, rotation of the bushing being prevented by flat guide sides, or other preferred means. A screwthreaded portion 26 in the needle stem 18 passes through a guide opening in the bushing and is in screwthreaded engagement with an adjusting arm 27 on the bushing, the latter being disposed in such manner as to be ready of access for application of a turning tool to a clamping screw 28 that draws the split ends of the` arm 27 together after adjustment of the closure is made; The lower portion of the bushing 25 has an exterior screw thread of coarse pitch that engages a collar 29 carried by the lever 22, a suitably disposed dowel screw 30 or the like insuring rotation of the collar with the lever. An adjustable'stop 31 on the yoke 23 is used to limit the return movement of the lever 22. A foraminous shield 32 is secured to the guide plates 14 within the casing in such manner that all fuel that is drawn through the outlet passes through the screen.

In setting up the carbureter the screw thread on the upper portion of the needle stem is used for accurately seating the needle against the closure. Thereafter movement of the throttle lever opens the auxiliary air inlet and the fuel outlet and at the same time raises the closure from its seat. 'Ihe particular disposition of the air passages insures direction of flow in the air currents of such character that the fuel is thoroughly mixed before it reaches the outlet. In case of wear the needle closure may be readj usted as desired. The opening through the main air tubes may be regulated by the casing. Because of the dual construction the carbureter is especially adapted for multi-cylinder engines and motors of large capacity and the separate adjustments permit regulation of the carbureter for supplying the different cylinders as is necessary, each cylinderof such motor usually presenting a working condition different from its fellow.

Obviously, changes in the details of construction may be made without departing from the spirit of the invention and I do not care to limit myself to any particular ing a common fuel supply chamber provided with air inlet tubes therethrough and a fuel inlet lnozzle in each tube with a casing on the base having mixing chambers each in communication through its lower end with an air tube, a boss on the top of each chamber in substantial'alinement with the nozzle, a cylindrical closure rotatable in the casing provided with an air inlet port and a mix- -ture outlet port, lateral nipples on the casing with openings therethrough adapted severally to register with the closure ports, a stemv on the closure rotatable in the casing boss, a throttle lever on the stem for rotatif ing and whose upper arm has a guide opening, a bushing non-rotatable and longitudinally reciprocable in the guide opening in screwthreaded engagement with the needle stem closure, means for securing the bushing and stem in adjusted position, a collar bearing against the throttle lever in screwthreaded engagement with the bushing, Ineans interlocking the lever and collar to turn together, and a stop on the yoke for limiting the movement of the companion throttle lever.

2. In a multiple float feed carbureter having a common fuel supply chamber provided with air inlet tubes therethrough and a fuel inlet nozzle in each tube with a casing on the base having mixing chambers each in com- Vmunication through its lower end with an air tube, a boss on the top of each chamber in substantial alinement with the nozzle, a cylindrical closure rotatable in the casing provided with an air inlet port and a mixture outlet port, lateral nipples on the casing with openings therethrough adapted severally to register with the closure ports, a stem on the closure rotatable in the casing boss, a throttle lever on the stem for rotating the closure, a needle closure controlling the mouth of the fuel nozzle and having a stem rotatable in an4 opening through the stem of the closure, a yoke whose lower end is adjustably secured on the boss of the casing and whose upper arm has a guide opening, a bushing non-rotatable and longitudinally reciprocable in the guide opening in screwthreaded engagement with the needle stem closure, means for securing the bushing and stem in adjusted position, a collar bearing against the throttle lever in screwthreaded engagement with the bushing, means interlocking the lever and collar to `turn together, a stop on the yoke for limiting the movement of the companion throttle lever, and gates having regulatable openings for controlling the air inlet tubes.

3. In a multiple float feed carbureter having a common fuel supply chamber provided with air inlet tubes therethrough and a fuel inlet nozzle in each tube with a casing on the base having mixing chambers each in communication through its lower end with an air tube, a boss on the top of each chamber in substantial alinement with the nozzle. a cylindrical closure rotatable in the casing provided with an air inlet port and a mixture outlet port, lateral nipples on the casing with openings therethrough adapted severally to register with the closure ports, a stem on the closure rotatable in the casing boss, a throttle lever on the stem for rotating the closure, a needle closure controlling the mouth of the fuel nozzle and having a stem rotatable in anopening through the stem of the closure, a yoke whose lower end is adjustably secured on the boss of the casing and whose upper arm has a guide opening, a bushing non-rotatable and longitudinally reciprocable in the guide opening in screwthreaded engagement with the needle stem closure, means for securing the bushing and stem in adjusted position, a collar bearing1 against the throttle lever in sorewthreaded engagement with the bushing, means interlocking the lever and collar to turn together, a stop on the yoke for limiting the movement of the companion throttle lever, a deector plate opposite one of the nipples of the easing Within the main closure, means for adjusting' the plate verti- 10 cally, and a foraminous cage Within the oasing' around Vthe air inlets.

In testimony whereof l affix my signature n presence of two Witnesses.

ERNEST N. BRODERICK. Witnesses:

C. R. STICKNEY, OTTO F. BARTHEL.

Uopies of this patent may be obtained for ve cents each, by addressing the Commissioner of Patente Washington, D. C. 

